//
//  PreferenceStore+Migrate.swift
//  TuskerPreferences
//
//  Created by Shadowfacts on 4/13/24.
//

import Foundation
import UIKit

extension PreferenceStore {
    func migrate(from legacy: LegacyPreferences) {
        let migrations: [any MigrationProtocol] = [
            Migration(from: \.theme.theme, to: \.$theme),
            Migration(from: \.pureBlackDarkMode, to: \.$pureBlackDarkMode),
            Migration(from: \.accentColor, to: \.$accentColor),
            Migration(from: \.avatarStyle, to: \.$avatarStyle),
            Migration(from: \.hideCustomEmojiInUsernames, to: \.$hideCustomEmojiInUsernames),
            Migration(from: \.showIsStatusReplyIcon, to: \.$showIsStatusReplyIcon),
            Migration(from: \.alwaysShowStatusVisibilityIcon, to: \.$alwaysShowStatusVisibilityIcon),
            Migration(from: \.hideActionsInTimeline, to: \.$hideActionsInTimeline),
            Migration(from: \.showLinkPreviews, to: \.$showLinkPreviews),
            Migration(from: \.leadingStatusSwipeActions, to: \.$leadingStatusSwipeActions),
            Migration(from: \.trailingStatusSwipeActions, to: \.$trailingStatusSwipeActions),
            Migration(from: \.widescreenNavigationMode, to: \.$widescreenNavigationMode),
            Migration(from: \.underlineTextLinks, to: \.$underlineTextLinks),
            Migration(from: \.showAttachmentsInTimeline, to: \.$showAttachmentsInTimeline),
            
            Migration(from: \.defaultPostVisibility, to: \.$defaultPostVisibility),
            Migration(from: \.defaultReplyVisibility, to: \.$defaultReplyVisibility),
            Migration(from: \.requireAttachmentDescriptions, to: \.$requireAttachmentDescriptions),
            Migration(from: \.contentWarningCopyMode, to: \.$contentWarningCopyMode),
            Migration(from: \.mentionReblogger, to: \.$mentionReblogger),
            Migration(from: \.useTwitterKeyboard, to: \.$useTwitterKeyboard),
            
            Migration(from: \.attachmentBlurMode, to: \.$attachmentBlurMode),
            Migration(from: \.blurMediaBehindContentWarning, to: \.$blurMediaBehindContentWarning),
            Migration(from: \.automaticallyPlayGifs, to: \.$automaticallyPlayGifs),
            Migration(from: \.showUncroppedMediaInline, to: \.$showUncroppedMediaInline),
            Migration(from: \.showAttachmentBadges, to: \.$showAttachmentBadges),
            Migration(from: \.attachmentAltBadgeInverted, to: \.$attachmentAltBadgeInverted),
            
            Migration(from: \.openLinksInApps, to: \.$openLinksInApps),
            Migration(from: \.useInAppSafari, to: \.$useInAppSafari),
            Migration(from: \.inAppSafariAutomaticReaderMode, to: \.$inAppSafariAutomaticReaderMode),
            Migration(from: \.expandAllContentWarnings, to: \.$expandAllContentWarnings),
            Migration(from: \.collapseLongPosts, to: \.$collapseLongPosts),
            Migration(from: \.oppositeCollapseKeywords, to: \.$oppositeCollapseKeywords),
            Migration(from: \.confirmBeforeReblog, to: \.$confirmBeforeReblog),
            Migration(from: \.timelineStateRestoration, to: \.$timelineStateRestoration),
            Migration(from: \.timelineSyncMode, to: \.$timelineSyncMode),
            Migration(from: \.hideReblogsInTimelines, to: \.$hideReblogsInTimelines),
            Migration(from: \.hideRepliesInTimelines, to: \.$hideRepliesInTimelines),
            
            Migration(from: \.showFavoriteAndReblogCounts, to: \.$showFavoriteAndReblogCounts),
            Migration(from: \.defaultNotificationsMode, to: \.$defaultNotificationsMode),
            Migration(from: \.grayscaleImages, to: \.$grayscaleImages),
            Migration(from: \.disableInfiniteScrolling, to: \.$disableInfiniteScrolling),
            Migration(from: \.hideTrends, to: \.$hideTrends),
            
            Migration(from: \.statusContentType, to: \.$statusContentType),
            Migration(from: \.reportErrorsAutomatically, to: \.$reportErrorsAutomatically),
            Migration(from: \.enabledFeatureFlags, to: \.$enabledFeatureFlags),
            
            Migration(from: \.hasShownLocalTimelineDescription, to: \.$hasShownLocalTimelineDescription),
            Migration(from: \.hasShownFederatedTimelineDescription, to: \.$hasShownFederatedTimelineDescription),
        ]
        
        for migration in migrations {
            migration.migrate(from: legacy, to: self)
        }
    }
}

private protocol MigrationProtocol {
    func migrate(from legacy: LegacyPreferences, to store: PreferenceStore)
}

private struct Migration<Key: PreferenceKey>: MigrationProtocol where Key.Value: Equatable {
    let from: KeyPath<LegacyPreferences, Key.Value>
    let to: KeyPath<PreferenceStore, PreferencePublisher<Key>>
    
    func migrate(from legacy: LegacyPreferences, to store: PreferenceStore) {
        let value = legacy[keyPath: from]
        if value != Key.defaultValue {
            Preference.set(enclosingInstance: store, storage: to.appending(path: \.preference), newValue: value)
        }
    }
}

private extension UIUserInterfaceStyle {
    var theme: Theme {
        switch self {
        case .light:
            .light
        case .dark:
            .dark
        default:
            .unspecified
        }
    }
}